Improvement in mttlet-saw mills



ilutrll ,gitana pero eine.

u. r. WoLcoTT, or CLAREM'ONT, NEW HAMPSHIRE.

Lezers Patent No. 94,683, zaad september 7, 1869.

IMPROVEMENT IN MULEY-BAW MILLS.

The Schedule referred to in these Lettes Patent and making part o! the same.

To all whom it may concern: v

Be it known that I, R. F. WOLCOTT, of' Claremont, in the county` of Sullivan, and State of New Hampshire, have invented a new and useful Improvement in Muley-Saw Mills; and I do hereby declare that' for the sides of the saw.

Also, certain improvements in the giggingback and feeding-devices.

Figure l represents a front elevation of my improved 2, wherel the 'jaws and guides are shown in dotted lines.

This arrangement gives a peculiar oscillatory movement to the cutting-edge of thesaw, which distributes the shock occasioned by the striking of' the saw into the log at two parts of the'saw, and measurely divides the effect into two separate shocks, occurringr at 'different points of time, thereby making the same less strainin g to the parts.

My improvements in the arrangements of the sideguides for the saw consist (in lieu of the common arrangement of a sliding guide on each side of the upper box) of a single sliding bar, (ll/arranged in the rear ofthe box, and provided with a toothed rack, E,

tobe actuated for adjusting up and down by a pinion and hand-drank.

Upon the lower end of the sliding bar, I provide a cross-head, F, ranging transversely of the lsaw-frame, and supporting, at each end, adjustable bars G, parallel with the sides of the saw, 'one on 'each side thereof, and carrying adjustable guides H, to be adjustedagainst the sides of the saw and held by setl screws.

For feeding and gigging the carriage, I arrange the rag-wheel I, on the feeding-shaft, with a con-v sidei'able concavity on the lside fronting the vertical shaft. K, from which it is actuated by a bevelpinion, L.

The object of this concavity is tomake room for a bevel friction-wheel, M, of sui'licient diameter to move the carriage back with the proper speed to be placed on the shaft K, above the pinion L, and to work with another bevel friction-wheel, M', on the feed-shaft, opposite to the rag-wheel.

The upper end of the shaft K is borne in one end of a vibrating bar, Npivoted near the centre, on the under side of the beam O, which supports the lower cross-head box, the other end of the said bar being connected to the shifting-lever P, also pivoted to the said beam, and engaging with a-pivoted dog,- R, on the top of the said beam, which holds the feeding-pinion L iu gear with the said ragwheel.

Motion is communicated `to the shaft K, Uy frictionwheels S T, from a shaftU, operated from the crank-shaft.

The face ofd the wheel T bears against the side of the driving-wheel S, and the former is movable to or from the axis of the-latter, tokvary the speed.

The effect of the necessary lpressure ofthe wheel T, to produce the required friction, is to spring the shaft K, so that when the shifting-lever Pis disengaged from the holding-dog R, the upper end of the shaft K will spring out of gear with the ragwhecl and bear the giggingback wheel M against the friction -wheel M', so that a -slight pressure,

by the operator, on the lever I, in the saine d-` rection, will cause the return-movement 'of the carrage.

The holding-dog R isdesigned to be actuated by the contact1 -ot' a projection on the carriage, to discharge the shifting-lever, for throwing the feed out of gear, in the usual manner.

For actuating the friction-wheel T, to change the feed, vI provide anti-friction rollers, X, towork in the groove of the hub of said-wheel on the `endsof the crotch, and this crotch is actuated by a long slide, Y, and lever, -Z. F

For adjusting or'varying the frictionof the wheels S T, I mount the lopposite end of the shaft U in a lever-support, X, free to oscillate on its bottom end, and having au .adjusting-screw, X?, at theA top, as shown in dotted lines in iig. 1, whereby a slight endwise-movement may be imparted to the said shaft, to or from the wheel T. Y

and tllerross-hezpd F, supporting the adjustable bars` Gr, carrying 'the adjustable guides H, all arranged to 4operate 'as and for the purpose specified.

.3. The concave rag-wheel I, friction-wheels M .MQ springing-shaft; K, and shifting-lever P, all arranged substantially as specified.

R. F. WOLCOTT.

Witnesses:

J. W. J EWETT, WM. COFFRIN. 

